Support Engineer applicants have rated the interview process at OpenAI with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 38.4% positive. This is according to Glassdoor user ratings.
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They reached out to me, the first conversation was mostly share the experience. I had a take-home assignment and a few days to complete it. After that they review and get back to you.